Nozzle



April. 1940- w..A. TWOMBLY 2,196,169

NOZZLE Filed March 31, 1938 m'z zmfi. Twamlly Patented Apr. 2, 1940 {UNITE STATES NOZZLE William z 'rwommy, Arlington, Mass, assignor to Frost Insecticide Company, Arlington, Mass.

Application .March 31,

2 Claims.

This invention relates to a nozzle and it provides a novel construction wherein the stream is projected a greater distance than with the usualv nozzle. I

More specifically, it is aimed to provide such a structure'utilizing a co-acting conical ybore portion, a cylindrical bore portion, both of said bore portions being relatively long, and the cylindrical bore portion with a bell wherein a partial vacuum is maintained by the flow or discharge of the liquid from the nozzle.

The more specific objects and advantages will become apparent from a consideration of the description following taken in connection with accompanying drawing illustrating an operative embodiment.

In said drawing:

Figure 1 is. a view in elevation of the improved nozzle, and

Figure 2 is a central longitudinal sectional view through the nozzle.

Referring specifically to the drawing wherein like reference characters designate likeor similar parts, the nozzle is illustrated at l0, being shown by way of example as of a single piece of metal or other material, although it may be sectional or otherwise as preferred.

Said nozzle may in any desired manner be provided with means for attachment to a hose or source of fluid supply and as shown such means consists of screw threads at H within the bore or passage I2 of the nozzle. To facilitate engagement by a Wrench or other tool for use in applying and removing the nozzle, the exterior thereof at one portion may be polygonal asat I 3.

Said bore I 2 has a tapered portion l4 whose wider end is substantially of the same diameter as the bore at the screw threads and which leads directly therefrom. Said conical portion l4 leads to a cylindrical bore portion l5 and said cylindrical bore portion I5 opens into a relatively largev chamber or bell [6 at the discharge end of the nozzle. It will be noted that the portions [4 and I5 are elongated.

I find with the construction described, that water or fluid discharging through the nozzle may be projected a greater distance than in existing nozzles and for example twenty-five per cent farther. This result is due to the combination of the portions [4, l5 and [6. Due to the smooth PATENT OFiCE 1938, Serial No. 199,239

taper of the conical wall of portion M, the size of the stream of water passing therethrough reduces gradually and progressively from the inside diameter of the feed pipe or hose to the diameter of the cylindrical passage l5 and in so doing, in- 5 creases the velocity of the flowing stream. Said cylindrical portion l5 disposes all velocity components of the stream in parallel positions and prevents eddy currents and swirling. The said space or bell I6 is very important since the flow 10 of liquid from the nozzle maintains a partial vacuum about the same and within the bell. Such partial vacuum prevents further contraction of the area of the flowing liquid (the coeficient of contraction being very nearly 1.00) and which boosts the velocity of the liquid as it leaves the nozzle so as to effect the greater projection of the stream.

Various changes may be resorted to provided they fall within the spirit and scope of the invention.

I claim as my invention:

1'. A nozzle of the class described having a conical bore portion to receive the liquid at the larger end, a cylindrical bore portion leading from the smaller end of the tapered portion having a length more than five times its diameter, and a bell space at the discharge end of the nozzle to which the cylindrical portion leads and constructed and arranged for creation of a partial vacuum within the bell about the liquid, said bell space being of greater diameter than the cylindrical portion, said tapered portion being elongated.

2. A nozzle of the class described having a conical bore portion to receive the liquid at the larger end, a cylindrical bore portion leading from the smaller end of the tapered portion having a length more than five times its diameter, a bell space at the discharge end of the nozzle to which the cyo lindrical portionleads and constructed and arranged for creation of a partial vacuum withinv thebell about the liquid, said bell space being of greater diameter than the cylindrical portion, said tapered portion being elongated, said nozzle being an integral body, and having screw threads at the attaching end interiorly thereof and from which the tapered portion leads.

WILLIAM A. TWOMIBLY. 

